| // |
| // ======================================================================== |
| // Copyright (c) 1995-2016 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.client; |
| |
| import java.util.List; |
| |
| import org.eclipse.jetty.client.api.Response; |
| import org.eclipse.jetty.client.api.Result; |
| import org.eclipse.jetty.util.log.Log; |
| import org.eclipse.jetty.util.log.Logger; |
| |
| public class HttpExchange |
| { |
| private static final Logger LOG = Log.getLogger(HttpExchange.class); |
| |
| private final HttpDestination destination; |
| private final HttpRequest request; |
| private final List<Response.ResponseListener> listeners; |
| private final HttpResponse response; |
| private State requestState = State.PENDING; |
| private State responseState = State.PENDING; |
| private HttpChannel _channel; |
| private Throwable requestFailure; |
| private Throwable responseFailure; |
| |
| public HttpExchange(HttpDestination destination, HttpRequest request, List<Response.ResponseListener> listeners) |
| { |
| this.destination = destination; |
| this.request = request; |
| this.listeners = listeners; |
| this.response = new HttpResponse(request, listeners); |
| HttpConversation conversation = request.getConversation(); |
| conversation.getExchanges().offer(this); |
| conversation.updateResponseListeners(null); |
| } |
| |
| public HttpConversation getConversation() |
| { |
| return request.getConversation(); |
| } |
| |
| public HttpRequest getRequest() |
| { |
| return request; |
| } |
| |
| public Throwable getRequestFailure() |
| { |
| synchronized (this) |
| { |
| return requestFailure; |
| } |
| } |
| |
| public List<Response.ResponseListener> getResponseListeners() |
| { |
| return listeners; |
| } |
| |
| public HttpResponse getResponse() |
| { |
| return response; |
| } |
| |
| public Throwable getResponseFailure() |
| { |
| synchronized (this) |
| { |
| return responseFailure; |
| } |
| } |
| |
| /** |
| * <p>Associates the given {@code channel} to this exchange.</p> |
| * <p>Works in strict collaboration with {@link HttpChannel#associate(HttpExchange)}.</p> |
| * |
| * @param channel the channel to associate to this exchange |
| * @return true if the channel could be associated, false otherwise |
| */ |
| boolean associate(HttpChannel channel) |
| { |
| boolean result = false; |
| boolean abort = false; |
| synchronized (this) |
| { |
| // Only associate if the exchange state is initial, |
| // as the exchange could be already failed. |
| if (requestState == State.PENDING && responseState == State.PENDING) |
| { |
| abort = _channel != null; |
| if (!abort) |
| { |
| _channel = channel; |
| result = true; |
| } |
| } |
| } |
| |
| if (abort) |
| request.abort(new IllegalStateException(toString())); |
| |
| return result; |
| } |
| |
| void disassociate(HttpChannel channel) |
| { |
| boolean abort = false; |
| synchronized (this) |
| { |
| if (_channel != channel || requestState != State.TERMINATED || responseState != State.TERMINATED) |
| abort = true; |
| _channel = null; |
| } |
| |
| if (abort) |
| request.abort(new IllegalStateException(toString())); |
| } |
| |
| private HttpChannel getHttpChannel() |
| { |
| synchronized (this) |
| { |
| return _channel; |
| } |
| } |
| |
| public boolean requestComplete(Throwable failure) |
| { |
| synchronized (this) |
| { |
| return completeRequest(failure); |
| } |
| } |
| |
| private boolean completeRequest(Throwable failure) |
| { |
| if (requestState == State.PENDING) |
| { |
| requestState = State.COMPLETED; |
| requestFailure = failure; |
| return true; |
| } |
| return false; |
| } |
| |
| public boolean responseComplete(Throwable failure) |
| { |
| synchronized (this) |
| { |
| return completeResponse(failure); |
| } |
| } |
| |
| private boolean completeResponse(Throwable failure) |
| { |
| if (responseState == State.PENDING) |
| { |
| responseState = State.COMPLETED; |
| responseFailure = failure; |
| return true; |
| } |
| return false; |
| } |
| |
| public Result terminateRequest() |
| { |
| Result result = null; |
| synchronized (this) |
| { |
| if (requestState == State.COMPLETED) |
| requestState = State.TERMINATED; |
| if (requestState == State.TERMINATED && responseState == State.TERMINATED) |
| result = new Result(getRequest(), requestFailure, getResponse(), responseFailure); |
| } |
| |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Terminated request for {}, result: {}", this, result); |
| |
| return result; |
| } |
| |
| public Result terminateResponse() |
| { |
| Result result = null; |
| synchronized (this) |
| { |
| if (responseState == State.COMPLETED) |
| responseState = State.TERMINATED; |
| if (requestState == State.TERMINATED && responseState == State.TERMINATED) |
| result = new Result(getRequest(), requestFailure, getResponse(), responseFailure); |
| } |
| |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Terminated response for {}, result: {}", this, result); |
| |
| return result; |
| } |
| |
| public boolean abort(Throwable failure) |
| { |
| // Atomically change the state of this exchange to be completed. |
| // This will avoid that this exchange can be associated to a channel. |
| boolean abortRequest; |
| boolean abortResponse; |
| synchronized (this) |
| { |
| abortRequest = completeRequest(failure); |
| abortResponse = completeResponse(failure); |
| } |
| |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Failed {}: req={}/rsp={} {}", this, abortRequest, abortResponse, failure); |
| |
| if (!abortRequest && !abortResponse) |
| return false; |
| |
| // We failed this exchange, deal with it. |
| |
| // Case #1: exchange was in the destination queue. |
| if (destination.remove(this)) |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Aborting while queued {}: {}", this, failure); |
| notifyFailureComplete(failure); |
| return true; |
| } |
| |
| HttpChannel channel = getHttpChannel(); |
| if (channel == null) |
| { |
| // Case #2: exchange was not yet associated. |
| // Because this exchange is failed, when associate() is called |
| // it will return false, and the caller will dispose the channel. |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Aborted before association {}: {}", this, failure); |
| notifyFailureComplete(failure); |
| return true; |
| } |
| |
| // Case #3: exchange was already associated. |
| boolean aborted = channel.abort(this, abortRequest ? failure : null, abortResponse ? failure : null); |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Aborted ({}) while active {}: {}", aborted, this, failure); |
| return aborted; |
| } |
| |
| private void notifyFailureComplete(Throwable failure) |
| { |
| destination.getRequestNotifier().notifyFailure(request, failure); |
| List<Response.ResponseListener> listeners = getConversation().getResponseListeners(); |
| ResponseNotifier responseNotifier = destination.getResponseNotifier(); |
| responseNotifier.notifyFailure(listeners, response, failure); |
| responseNotifier.notifyComplete(listeners, new Result(request, failure, response, failure)); |
| } |
| |
| public void resetResponse() |
| { |
| synchronized (this) |
| { |
| responseState = State.PENDING; |
| responseFailure = null; |
| } |
| } |
| |
| public void proceed(Throwable failure) |
| { |
| HttpChannel channel = getHttpChannel(); |
| if (channel != null) |
| channel.proceed(this, failure); |
| } |
| |
| @Override |
| public String toString() |
| { |
| synchronized (this) |
| { |
| return String.format("%s@%x req=%s/%s@%h res=%s/%s@%h", |
| HttpExchange.class.getSimpleName(), |
| hashCode(), |
| requestState, requestFailure, requestFailure, |
| responseState, responseFailure, responseFailure); |
| } |
| } |
| |
| private enum State |
| { |
| PENDING, COMPLETED, TERMINATED |
| } |
| } |